Sliding breech-block for recoil-operated firearms.



. 0. ROSTEL. SLIDING BREEGH BLOCK FOR REGOIL OPERATBD FIREARMS.

-APPLIGATION FILED MAR, 16, 1914.

1,095,738. Patented May 5, 191@ Z SHEETS-SHEET 1.

Patented vMaly 5, 1914n 2` SHEETS-SHEET 2.

. c. ROSTEL; f SLIDING BREEGH BLOCK POR REGOIL OPERATED FIREARMS.

APPLICATION FILED MAR. 16, 1914.

CARL RSTEL, 0F BERLIN, GERMANY.

SLIDING BREECH-BLOCK FOR .RECOIL-OVPERATED FIREARMS'.,

' specification of Letters Patent.

` patented May 5, 1914.'.

/ Application lei March 16, 1914. Serial No. 825.03.

To all whom 'it may concern Re it known that I, CARL Rs'rnc, engineer, subject of the Klng of Prussia, residing at No. l2 Bayerischerplatz, Berlin, W.,

Germany, have invented certain new and useful Improvements in Sliding Breech- Blocks for Recoil-OperatedA Firearms, of which the following is a specification.

This inventionrelatcs to a special construction of sliding breech block for recoiloperated ir'e arms of the fixed barrel type, whereinthe locking is effected by pawls pivoted to the breech block. Breech blocks of this kind are known. The present invention, however, consists in operating the said pawls positively by a special bolt, which extends forwardly through the whole length of the breech block and terminates within I reach of the pawls so as to permit the enwhich Figure l is a longitudinal Vertical section, showing the breech block in its advanced position, and Figs. 2 and 3 are longitudinal horizontal sections showing the breech block in'advanced and retracted positions,

ing the block with the barrel sleeve, areI adapted to enter correspondingly-shaped seats 5 in the latter. The mounting of the pawls themselves in the breech block is effected in such a manner that the pivot pins 3 are disposed at the front ends of the pawls, while the rear ends thereof are adapted to swing out freely and bear against the correspondingly beveled walls 'in which the studs 8 engage.

of the said seats. Now the adjustment or controlling of these pawls in the locking and unlocking or releasing position is effected positively by means of the bolt 6 which is slidably arranged withinthe breech block, said bolt extending through the whole length of the breech block to dispose its front end within reach of the pawls in order to be able to act directly thereon. For this purpose, the bolt has on its front end an offset part, which carries projections in the form ot' roundstuds 8 that extend above and below the same. The pawls are notched at their rear ends to form inclined grooves 9,

The inclination of these grooves to the longitudinal axis of the system is such that in the case of an axial displacement of the bolt 6, the required looking and unlocking movements of the pawls result. therefrom. The displacement of the bolt itself is'eifected, in variation to the well known Mannlicher sliding breech block, partly by a spring action and partly by a recoil action, in such a manner that the said bolt Which is .limited in its movements en both sides, is forced backA by.

the recoil and swings the pawls inwardly, while when closing the breech under the action of the locking spring the said bolt advances the breech block and as soon as the latter is in its foremost position, it swings the pawls outwardly into the seats 5. When firing, the breech block locked by the pawl in the barrel sleeve, Will then be secured in locked position; it cannot .perform any opening movement until the bolt has been returned by the recoil to such -an extent ythat it has swung the pawls inwardly com-.

pletely out ot their seats. During the advance of the breech block, the pawls bearing on the inner `wall of the barrel sleeve prevent they advance of thle bolt in the breech block until the latter has reached the end of its path, at which time the pawls are disposed opposite their seats 5, so that the bolt can now perform the required relative movement in the breech block and can swing the pawls into said seats against the barrel sleeve.

It is obvious that the bolt, by reason ot its extension through the breech block, has to carry the firing pin, which is so arranged in a longitudinal bore of the bolt that lts Tear lend projects into a downwardly-opening notch in the bolt, in which the hammer 13 works. Behind this notch, the sliding rod 11 of the locking spring is loosely attached to a depending lug on the bolt,l so that the latter acts directly on the. pawls and isalso under the direct action of the locking spring. The movement of the bolt in the breech block is limited by the rear connecting pin 7 which extends through a guide slot in said bolt. By arranging the hammer lock in connection with the rebounding lock 14: used for cooking and discharg-` ing, all automatic safety means for preventing firing when the breech is not completely locked can be dispensed with, because, inthis case, the iring pin l2 is held clear of the detonating cap of the cartridge by the incompletely advanced bolt 6, so' that even when the hammer strikes it cannot come in contact with the cap.

I claim: i

l. In a fire-arm, the combination, with a sliding, hollow breech block having pivotally-mounted barrel-engaging means at its front end; of a bolt slidably mounted Within said breech block and positively connected with said barrel-engaging means, for movlocking pawls pivoted to the front end there- -front end projecting between and positively connected with said pawls for forcing the latter outwardly and inwardly during the movements of the bolt.

4. In a lire-arm, the combination, with a sliding, hollow breech block, and a pair of locking pawls pivoted to the front end thereof and formed with opposed, inclined grooves; of an endwise-movable bolt mounted within said breech block and having its front end provided with projections slidably engaged in said grooves, for forcing said pawls outwardly .and inwardly `during the movements of the bolt.

5. In a fire-arm, the combination, with a sliding, hollow breech block having a pair of opposed locking members pivoted to its front end; of a hollow bolt slidably mounted within said breech block .and positively connected at its front end with said locking members, for forcing the same into and out of operative position during the movements of `the bolt, said bolt having a downwardlyopening notch adjacent its rear end; a firing pin sli'dably mounted within said bolt and projecting at its rear end into said notch; a hammer working in said notch; and a sliding rod connected to the rear end of said bolt.

In testimony whereof I have affixed my signature in presence of two witnesses.

CARL RSTEL.

Witnesses: NUvLo GUOIEM, LORENZO SULINERD. 

